BANGOR – The Challenger Learning Center of Maine will host a Space Day Open House From 3:30 to 6:30 p.m. Wednesday, May 4, at 30 Venture Way in Bangor.¬† The event is open to the public with numerous presentations and activities planned during the open house.¬† For more information or to RSVP for this event, call 990- 2900 ext. 1.